Safety attachment.



v I 59mm.

" SAFETY ATTACHMENT. 7 APPLICATION FILED JULYIB, r1914.

T Patented Feb. 22, 1916.

3 SHEETS-SHEET] I E. ROTH.

1 v SAFETYATTACHMENT.

, APPLICATION FILED JULYIB. I914.

Patented Feb. 22, 1916.

a SHEETS-SHEET 2.

E, ROTH. SAFETY ATTACHMENT. I APPLICATION FILED JULYTB, 1914.

Patented Feb. 22,1916.

3 SHEETS-SHEET 3' srarns PATENT onr ion QEMIL Born, on CLEVELAND, OHIO,Ass'icnon TO THE CLEVELAND FOUNDRY comramr, or cnnvnnann, OHIO, Aconrona'rrcn or emo. H

SAFETY ATTACHMENT.

Specification of Letters Patent.

a neauon filed m 12, 1914.. Serial No. 851,705.

' To all whom it may concern:

foperation of a treadle, lever, handle, button,

Be it known that'I, EMIL ROTH, acitizen ofithe United States, residingat Cleveland, inuthe county of Ouyahoga and State of Ohio,-have inventeda certain new and useful Improvement in Safetfy Attachments, of'

which the following is'a 11, clear, and ex,- act description,referencebeing had to the accompanying drawings. w

fll This invention relates to safety attachinents for punch presses andsimilar machinery wherein there is danger of injury, to the hands andarms of the operator through failure to remove the same from the path ofthemoving parts, and has particular relation to machines compr singmoving parts which are ordinarily at rest but which are actuated for oneor more excursions by the orother starting device.

Among the objects of this invention are i theprovision of means formaintaining the safety gate or guard in protecting position .until theoperation of the machine has 25.

nearly or entirely ceased the provision of J ineans whereby'the gate orguard is retained ln protective position during succeeding or repeating'movements of the mechanism, whether. the repeat movement be accidental-.or intentional; the provision of a device wherein the dwell of the gateor guard in a protective position is dependent upon the operation of themachine and not upon any actgof the operator; the provision of a devicewherein the return of the gate or guard toinoperative position will beutilized to effect more certainly the stoppage of the operating partsand the provision of a device of this nature of great simplicity,convenience, reliability, and efficiency; while fur- Ither objects andadvantages will become apparent as this description proceeds. f

Generally speaking my invention may be defined as consisting of thecombinations.

and constructions recited in the claims here to annexed and illustrated,1n one embodiment, in the drawings accompanying and forming part of thisapplication, wherein;

Figure 1 represents a side elevation of a t0,a portion of the machinebeing broken away to show the construction and arrange ment of parts; Fg. 2 represents a side elemachine having my lnvention appliedtherevation of the same machine, the various parts of the safetyattachment. and of the machine being shown in position assumed duringoperation; Fig. 3 is a perspective view of the movable portion of the Isafety attachment; Fig. 4 represents afront elevation of the machineillustrated in Figs. 1 and 2; Fig. 5 isa detail, cross-sectional Viewtaken upon the line 5--5 of Fig. 1 and looking in the direction of thearrows; Fig. 6 is a'cletail view of the wheel hub and main shaft takenupon the line 66 of Fig. 5 and looking in the direction of the arrows;and

Patented Feb. 22, 1916,

Fig. 7 is a detail view of the clutch and releasing cam taken upon theline 7 -7 of Fig.

5 and looking in the direction of the arrows.

Describing the parts by reference charac ters 1 represents the frame ofthe machine, here shown as a punch press, 2 represents the main shaftand 3 a. fly wheel loosely sleeved upon that shaft. In the presentembodiment the shaft 2 is illustrated as formed with a crank 4 suitablysecured to a reciproeating die member 5 adapted to cooperate with afixed.v die member 6 carried by the I bedor table 7 supported by themachine frame, the arrangement being such that one completereciprocation of the movable die comprising a rock bar 8 mounted in agroove in the part of the shaft 2 surrounded'by the hub of the flywheel, saidrock bar extending to one side of the hub and being thereprovided with a finger 9 whose outer extremity is formed at one sidewith a flat abutment portion 10 (see Fig. 7). Connected to this finger,and to a suitable projection carried by the shaft, is a springlQwhichtends to rock the bar 8. Thisbar, as will appear moreparticularlyifromFig; 6, has an outer surface which, when the parts arein the position shown in Figs. 1,5, 6 and 7, is concentrio with theshaft 1 andforms a part of the outer cylindrical surface thereof. Thehub i-s rocked, is adapted to receive one of the driving relation.

of the fly Wheel is provided with bushing having a recesslii which, whenthe bar 8 ,mechanism is inoperative, is prevented by theengagement ofthe finger 9 with a clutch releasing member or catch 17 carried by somestationary part of the machine.

Operatii'ely secured to the clutch releasing' member or catch 17 is areciprocable rod 18 suitably supported by the machine frame as'by meansof the angle plates 19, and

having. at its end the yoke 20 formed with an elongated slot 21. Asuitable spring 22 'normallymaintains the rod 18 in a position to holdthe latch '17 in the path of movement of the'finger 9. Pivoted to thema- "chine frame at the rear'of this rod 18 is an arm 25 which passesthrough the slot 21 andat its ,front end carries the safety gate oriiard 26r so'far as my present invention is concerned this gate or guardmay take any desirable o'rsuitable shape, the device here shownconsisting merely of a horizontal rodConnected-lamavertical hanger 27secured to a' horizontal' bracket 28 which in turn is adp1stablfsecuredto the arm 25.

The shape of the arm 25 will depend upon the particular shape, design,and construction of the machine toywhichthe samemay be'applied. Theguard carrying member or arm 25 is normally held in'elev'ated positionas shown in Fig. 1 by means of a spring 30 carried by tile'lfltitihifle,frame, the parts beinszso arranged and designed that this arm willnormally lie-in the upper end of the slot 21'and in contact with theupper end wall thereof" In thepresent embodiment I have shownthe lever25 as formed. with an angular porti'onf31 arranged to engage the. faceof the yoke-20 when the arm is in e1e-' vated position and thus form apositive stop for the same.

.Pivoted to the arm 25 at a. suitable point, here illustrated as betweenthe pivot 24 and yoke20. is an operating rod 32 to which is attachedatreadle or other suitable actuator. Also connected to the arm 25 isalatch 34 projecting through a slotted bracket 35 carried by the machineframe, and having a projection 36 extending to a point adjacent theshaft 2. the latch being formed with a shoulder 37 adapted to engage thebracliet when depressed so as to retain the arm 25 in loweredposition'u'ntil the release of the latch. A spring 38 connected to themachine frame and to the latch 34 tends to a draw the latch to engagingposition, while a cam 39 carried by the main shaft 2zserves to engage,the projection 36 and disengage the latch at a proper time in theoperation of the machine. Also the arm 25 is'for'med with a tooth. 10arranged to be drawn into and to fill the slot 21 upon the depression ofthis arm for a purpose to be hereafter described. So long as the clutchmember is retained in the position shown in Figs. 1, (i and 7 by theengagement of the catch 17, the fly wheel will rotate freely on the endof the main shaft. Upon the actiiation of the rod I 32 the arm 25 isfirst drawn downwardly so as to bring the guard or gate between theoperator and the (lies and force him to remove his hands therefrom. Uponthe arrival of the arm 25 at tlie'lower end of the slot 21the yoke 20androd 18 are moved against the tension of thespring 22, witlr drawingthe catch 17 and freeing the finger 9 which is then free to be moved bythe spring 12 so as to rock the bar 8 into engagement with the fly wheelupon the arrival of the notch 16 opposite thereto.v Simultaneously thetooth 40 has been drawn into the slot 21 and the latch 34 has becomelocked against the bracket The shaft 2 is .now

- forced to make at least one rotation. and in case the operatorreleases the rod prior to the completion of this rotation, -it willordinarily be arrested when one rotation has been completed, the cam 39having released the latch 34 so as to permit the arm 25 to rise andthereby free the rod 18 so that the spring 22 can restore the catch'17to ob- Stll'lctllifl position. However ifthe operative shall hold therod depressed longer than required to make a complete revolution, thelatch 34 will merely be rocked to and fro as the cam 39 passes the sameand will again become locked in depressed position so as to. retain thegate in protecting position until its release upon a succeedingrotation, thus permittingthe raising of the gate only at a predeterminedperiod in the rotation of the main shaft. Conveisely; if the operativegives the red 32 only an instantaneous shove, the gate is necessarilylowered before the mechanism can act and raising of'the gate is delayeduntil the first rotation is substantially completed and the movable diei has been withdrawn-toits'elevated position.

In case the catch 17 should for some reason fail to be returned toobstructing positionupon the release of the rod 32 and the disengagementof the latch 34, the engagement of the yoke 20 with the tooth 40 willlikewise pre ent any movement of. the guard membrf This is somethingwhich can occ'ii'r bv reason'of a binding of the rod 18 or a slipping orcramping of some of the joints. However, in case the movement besufiiciently great todisengage the tooth 40 from the end of the slot,the upward movement of the arm 25 under the influence of the spring 30will cause it to strike the end wall of the slot a sharp upward blowthus tending the more surely to return the.

v 3, In a safety' guard h to obstructingpositiom Thus it will een thatthe gateor guard can be moved non-protecting positmnpnly during a rtainphase the machine operation, ely,'that immediately before the clutch er'9 comes to theqcatch l7, and that n such movement of this gate theaction he tooth 40 from the yoke will move this h towardengagingposition. If the rod sreleased at anytime before the enlarged tion ofthe;cam passes by the extension the latch 34 thegate r guard will rywith it the clutch catch. If e1 ed until after'this part of the cam hasftfithej latch the gate will beheld down and he rejss will repeat.

ail and pointediout 'at length thevmode applying the same to aparticular mechain, 't will, be understood that I do not onfine myselfto use with such mechanism to the mode ofapplying the same herein'etyforth. AlsdI do not confine myself to v details, constructions orarrangements eptas the same are positively included the claims hereto,annexed or rendered ecessary by the prior state of the art.

Ilaving thus described my invention,

at Iclai is nes the combination, with a guard car: ing member, of amanually operable mem r, connected to ,the guard carrying memr, a clutchfor \the'machine, a clutch reng member, said guard carrying mem- 1;being independentlymovable with relan to the clutch releasing memberuntil the ive position, additional movement of the guard carrying memberser the clutch releasing member,

, 1 to said guard carrying memb adapted to lock the same in protectiveposition. .and striking means carried by the, machine and adapted torelease said latch apredetermined time in the machine opation. t 2. In asafety guard attachment for mathe combination, with a guard cari llyoperable ember connected thereto and arranged to move the sameintoiprotective position, of

clutch releasingmember operatively concted to said guard carrying memberand a latch connect er and initiation of 'the'movement of said guardember into protectiveposition, means nendent of said manually'operablememfor retaining said guard in protective position, and means operativeby the movement of the machine for disengaging said rst means andrestoring said guard to unrotective position in fixed phase relationwith the machine loperation;

attachment of the lhile I have described my invention in 1. In a safetyguard attachmcnt'for mar ard' is moved substantially to its protec vingto actuate nly toward the e character set forth, the combination, with aguard carrying member, a clutch releasing member, and connectionsbetween said members whereby the former will be moved to,releasingpo'sition upon the arrival of the later at protective position,of means operative substantially simultaneously with the actuation ofsaid clutch releasing member for locking said guard carrying member inprotective position, and means operated by the clutch driven mechanismfor unlocking said guard carrying member at a predetermined time in themovement' of such mech 'anism. I y v 4. In a safety guard attachment ofthe character set forth, the comoination, with a guard carrying member,a clutch releasing member, and connectionsbetwcen said members wherebythe former willbe moved to releasing position upon'the arrival of thelatter at protective position, of means operative substantiallysimultaneously with the actuation of. said clutch releasing member,forlocking said guard carrying member in protcctivvposition, meansoperated by the clutch driven mechanism for unlocking said. guardcarrying member at a predetermined time in the movement of suchmechanism, and means for preventin the movement of said guard carryingmom or to unprdtecting position even after such unlocking exceptsimultaneously With the return movement 'of said clutch releasing membertoward engaging position.

5. In a safety guard attachment of the character set forth, thecombination, with a guard carrying member and a clutch releasing memberoperatively connected thereto so as to be actuated upon the arrival ofsaid first member at protective position, of a latch device connected tosaid guard carrying member and adapted to secure the samein protectingposition, and a disengaging member carried by the clutch drivenmechanism and adapted to engage said'latch memher at a predeterminedpoint in the operation'of said mechanism whereby said guard carryingmember is unlocked.

'6. In a device ofth'e character set forth, the combination, \vithaconstantly operated power device, and mechanism adapted to be driventhereby, .of a clutch for said mechanism, a clutchreleasing memberadapted to disengage saidpowerdevice from said mechanism atpredetermined phases of the opera 'tion of the same, guard devicesadapted to be interposed between the mechanism and operator, manuallyoperable means for moving said guard devices to protecting position,connections between said guard devices and said clutch releasingmechanism whereby engagement of said clutch is permitted upon themovement of said guard devices to protecting position, and means forpreventingthe movement of said guard 130 devices to non-protectingposition except betweeficertain phases of the operation of themeehanlsm.

driven thereby, of a clutch for said mechanism, a clutch releasingmemberadapted to disengage said power device from'said mechanism atpredetermined phases of the operation ofthe same, guard devices adaptedto be interposedbetween the mechanism and operator, manually operablemeans for moving said guard devices to protecting position, connectionsbetween said guard devices and said clutch releasing mechanism wherebyengagementof said clutchis permitted upon the movement of said guardtive upon the return of said guard devices to-non-protecting positionfor moving said clutch releasing member toward engaging position, andmeans for preventing the return of said guard devices to non-protectingposition except when said mechanism has arrived at a phase of itsoperation immediately. preceding that at which sald clutch W maybedisengaged.

7, In -a device; of the character set forth, the combination, with aconstantlyloperated powerdevice, and mechanism adapted to be- 8. In adevice of the clia actvr described, thecomb1nat1on,.\ v1th a guardcarrylng member, of a'catch releasing member, a yoke J EMIL ROTH.Witnesses W. E. SHEPPARD, L. S. CHADWICK.

